PROPOSED TITLE 24 UPDATED EFFICIENCY REQUIREMENTS
TABLE 110.2-A ELECTRICALLY OPERATED UNITARY AIR CONDITIONERS AND CONDENSING UNITS –
MINIMUM EFFICIENCY REQUIREMENTS
Equipment Type
Air conditioners,
air cooled
both split system
and single package
Air conditioners,
water cooled
Size Category
≥ 760,000 Btu/h
Efficiency
9.7 EER
b
≥ 65,000 Btu/h and
< 135,000 Btu/h
12.1 EERb
13.9 IEERb
≥135,000 Btu/h and
< 240,000 Btu/h
12.5 EER
≥240,000 Btu/h and
< 760,000 Btu/h
≥ 135,000 Btu/h and
< 240,000 Btu/h
≥240,000 Btu/h and
< 760,000 Btu/h
≥ 760,000 Btu/h
c
13.9 IEER
12.4 EER
12.1 EER
b
ANSI/AHRI 340/360
b
ANSI/AHRI 340/360
b
ANSI/AHRI 340/360
b
b
ANSI/AHRI 340/360
b
12.1 IEER
11.7 EER
ANSI/AHRI 340/360
b
12.2 IEER
11.9 EER
b
b
12.3 IEER
12.0 EER
ANSI/AHRI 340/360
b
13.6 IEER
12.2 EER
ANSI/AHRI 340/360
b
13.5 IEER
≥65,000 Btu/h and
< 135,000 Btu/h
Test Procedure
b
11.2 IEER
≥ 760,000 Btu/h
Air conditioners,
evaporatively cooled
a
b
ANSI/AHRI 340/360
b
11.9 IEER
b
Condensing units,
air cooled
≥ 135,000 Btu/h
10.5 EER
11.8 IEER
Condensing units,
water cooled
≥ 135,000 Btu/h
13.5 EER
14.0 IEER
Condensing units,
evaporatively cooled
≥ 135,000 Btu/h
13.5 EER
14.0 IEER
ANSI/AHRI 340/360
ANSI/AHRI 365
a
IEERs are only applicable to equipment with capacity control as per ANSI/AHRI 340/360 test procedures
b
Deduct 0.2 from the required EERs and IEERs for units with a heating section other than electric resistance
heat.
c
Applicable test procedure and reference year are provided under the definitions.
TABLE 110.2-B UNITARY AND APPLIED HEAT PUMPS, MINIMUM EFFICIENCY REQUIREMENTS
Equipment Type
Air Cooled
(Cooling Mode)
Size Category
Subcategory or Rating
Condition
Efficiency a
≥ 65,000 Btu/h and
< 135,000 Btu/h
11.0 EERb
11.2 IEERb
≥ 135,000 Btu/h and
< 240,000 Btu/h
10.6 EERb
10.7 IEERb
Split system and
single package
Test Procedurec
ANSI/AHRI 340/360
9.5 EERb
9.6 IEERb
≥ 240,000 Btu/h
Water source (cooling
mode)
≥ 65,000 Btu/h and
< 135,000 Btu/h
86ºF entering water
13.0 EER
Water source (cooling
mode)
≥ 135,000 Btu/h and
< 240,000 Btu/h
86ºF entering water
13.0 EER
59ºF entering water
18.0 EER
ISO-13256-1
77ºF entering water
14.1 EER
ISO-13256-1
86ºF entering water
10.6 EER
ISO-13256-2
59ºF entering water
16.3 EER
ISO-13256-1
77ºF entering water
12.1 EER
ISO-13256-2
47° F db/43° F wb
outdoor air
3.3 COP
17° F db/15° F wb
outdoor air
2.25 COP
Groundwater source
(cooling mode)
< 135,000 Btu/h
Ground source (cooling
mode)
< 135,000 Btu/h
Water source water-towater (cooling mode)
< 135,000 Btu/h
Groundwater source
water-to-water (cooling
mode)
< 135,000 Btu/h
Ground source brineto-water (cooling
mode)
< 135,000 Btu/h
Air Cooled
(Heating Mode)
Split system and
single package
≥ 65,000 Btu/h and
< 135,000 Btu/h
(cooling capacity)
ISO-13256-1
ANSI/AHRI 340/360
≥ 135,000 Btu/h
(cooling capacity)
47° F db/43° F wb
outdoor air
3.2 COP
17° F db/15° F wb
outdoor air
2.05 COP
Size Category
Subcategory or Rating
Condition
Efficiency a
Test Procedurec
Water source (heating
mode)
< 135,000 Btu/h
(cooling capacity)
68ºF entering water
4.3 COP
ISO-13256-1
Water source (heating
mode)
 135,000 Btu/h and
< 240,000 Btu/h
(cooling capacity)
68ºF entering water
2.9 COP
ISO-13256-1
< 135,000 Btu/h
(cooling capacity)
50ºF entering water
3.7 COP
ISO-13256-1
< 135,000 Btu/h
(cooling capacity)
32ºF entering water
3.2 COP
ISO-13256-1
< 135,000 Btu/h
(cooling capacity)
68ºF entering water
3.7 COP
ISO-13256-2
< 135,000 Btu/h
(cooling capacity)
50ºF entering water
3.1 COP
ISO-13256-2
< 135,000 Btu/h
(cooling capacity)
32ºF entering water
2.5 COP
ISO-13256-2
Equipment Type
Groundwater source
(heating mode)
Ground source (heating
mode)
Water source water-towater (heating mode)
Groundwater source
water-to-water (heating
mode)
Ground source brine-towater (heating mode)
a
IEERs are only applicable to equipment with capacity control as per ANSI/AHRI 340/360 test procedures.
b
Deduct 0.2 from the required EERs and IEERs for units with a heating section other than electric resistance
heat.
c
Applicable test procedure and reference year are provided under the definitions.
TABLE 110.2-C AIR-COOLED GAS-ENGINE HEAT PUMPS
Equipment Type
Size Category
Subcategory or Rating
Condition
Efficiency
Test Procedurea
Air-Cooled GasEngine Heat Pump
(Cooling Mode)
All Capacities
95° F db
Outdoor Air
0.60 COP
ANSI Z21.40.4A
Air-Cooled GasEngine Heat Pump
(Heating Mode)
All Capacities
47° F db/43° F wb
Outdoor Air
0.72 COP
ANSI Z21.40.4A
a
Applicable test procedure and reference year are provided under the definitions.
TABLE 110.2-D WATER CHILLING PACKAGES – MINIMUM EFFICIENCY REQUIREMENTS a,b
Equipment Type
Air Cooled, With
Condenser
Electrically Operated
Size Category
Path A Efficiency a,b
Path B Efficiency a,b
< 150 Tons
≥ 10.100 EER
≥ 13.700 IPLV
≥ 9.700 EER
≥ 15.800 IPLV
≥ 150 Tons
≥ 10.100 EER
≥ 14.000 IPLV
≥ 9.700 EER
≥ 16.100 IPLV
Test Procedure c
AHRI 550/590
Air Cooled,
Without Condenser
All Capacities
Air-cooled chillers without condensers must be rated
with matching condensers and comply with the aircooled chiller efficiency requirements.
All Capacities
Reciprocating units must comply with the watercooled positive displacement efficiency
requirements.
Electrically Operated
Water Cooled,
Electrically Operated,
Reciprocating
AHRI 550/590
(Reciprocating)
< 75 Tons
≤0.750 kW/ton
≤ 0.600 IPLV
≤ 0.780 kW/ton
≤ 0.500 IPLV
≥ 75 tons and < 150 tons
≤ 0.720 kW/ton
≤ 0.560 IPLV
≤ 0.750 kW/ton
≤ 0.490 IPLV
≥ 150 tons and < 300 tons
≤ 0.660 kW/ton
≤ 0.540 IPLV
≤ 0.680 kW/ton
≤ 0.440 IPLV
≥ 300 tons and < 600 tons
≤ 0.610 kW/ton
≤ 0.520 IPLV
≤ 0.625 kW/ton
≤ 0.410 IPLV
≥ 600 tons
≤ 0.560 kW/ton
≤ 0.500 IPLV
≤ 0.585 kW/ton
≤ 0.380 IPLV
< 150 Tons
≤ 0.610 kW/ton
≤ 0.550 IPLV
≤ 0.695 kW/ton
≤ 0.440 IPLV
≥ 150 tons and < 300 tons
≤ 0.610 kW/ton
≤ 0.550 IPLV
≤ 0.635 kW/ton
≤ 0.400 IPLV
≥ 300 tons and < 400 tons
≤ 0.560 kW/ton
≤ 0.520 IPLV
≤ 0.595 kW/ton
≤ 0.390 IPLV
≥ 400 tons and < 600 tons
≤ 0.560 kW/ton
≤ 0.500 IPLV
≤ 0.585 kW/ton
≤ 0.380 IPLV
≥ 600 Tons
≤ 0.560 kW/ton
≤ 0.500 IPLV
≤ 0.585 kW/ton
≤ 0.380 IPLV
Water Cooled,
Electrically Operated
Positive Displacement
Water Cooled,
Electrically Operated,
Centrifugal
AHRI 550/590
Size Category
Path A Efficiency a,b
Path B Efficiency a,b
All Capacities
≥0.600 COP
N.A. d
Water Cooled
Absorption, Single
Effect
All Capacities
≥ 0.700 COP
N.A. d
Absorption Double
Effect, Indirect-Fired
All Capacities
≥ 1.000 COP
≥ 1.050 IPLV
N.A. d
Absorption Double
Effect, Direct-Fired
All Capacities
≥ 1.000 COP
≥1.000 IPLV
N.A. d
Water Cooled Gas
Engine Driven Chiller
All Capacities
≥ 1.2 COP
≥ 2.0 IPLV
N.A. d
Equipment Type
Air Cooled Absorption,
Test Procedure c
Single Effect
a
ANSI/AHRI 560
ANSI Z21.40.4A
No requirements for:
•
Centrifugal chillers with design leaving evaporator temperature < 36°F; or
•
Positive displacement chillers with design leaving fluid temperature ≤ 32°F; or
•
Absorption chillers with design leaving fluid temperature < 40°F
b
Must meet the minimum requirements of Path A or Path B. However, both the full load (COP) and IPLV must be
met to fulfill the requirements of the applicable Path.
c
See Section 100.1 for definitions
d
NA means not applicable
TABLE 110.2-E PACKAGED TERMINAL AIR CONDITIONERS AND PACKAGED TERMINAL HEAT PUMPS –
MINIMUM EFFICIENCY REQUIREMENTS
Equipment Type
Size Category (Input)
Subcategory or Rating
Condition
Efficiency
PTAC (Cooling mode)
Newly constructed or
newly conditioned
buildings or additions
All Capacities
95°F db Outdoor Air
14.0 - (0.300 x Cap/1000)a EER
PTAC (Cooling mode)
Replacements b
All Capacities
95°F db Outdoor Air
10.9 - (0.213 x Cap/1000)a EER
PTHP (Cooling mode)
Newly constructed or
newly conditioned
buildings or additions
All Capacities
95°F db Outdoor Air
14.0 - (0.300 x Cap/1000)a EER
PTHP (Cooling mode)
Replacements b
All Capacities
PTHP (Heating Mode)
Newly constructed or
newly conditioned
buildings or additions
All Capacities
-
3.7 - (0.052 x Cap/1000)a COP
PTHP (Heating mode)
Replacements b
All Capacities
-
2.9 - (0.026 x Cap/1000)a COP
Test Procedure c
ANSI/AHRI/CSA
310/380
95°F db Outdoor Air
10.8 - (0.213 x Cap/1000)a EER
Equipment Type
SPVAC (Cooling
Mode)
SPVHP (Cooling
Mode)
SPVHP (Heating
Mode)
SPVAC (Cooling
Mode), nonweatherized
space constrained
SPVHP (Cooling
Mode), nonweatherized
space constrained
SPVHP (Heating
Mode), nonweatherized
space constrained
Size Category (Input)
Subcategory or Rating
Condition
Efficiency
<65,000 Btu/h
95°F db / 75°F wb
Outdoor Air
10.0 EER
≥65,000 Btu/h and
<135,000 Btu/h
95°F db / 75°F wb
Outdoor Air
10.0 EER
≥135,000 Btu/h and
<240,000 Btu/h
95°F db / 75°F wb
Outdoor Air
10.0 EER
<65,000 Btu/h
95°F db / 75°F wb
Outdoor Air
10.0 EER
≥65,000 Btu/h and
<135,000 Btu/h
95°F db / 75°F wb
Outdoor Air
10.0 EER
≥135,000 Btu/h and
<240,000 Btu/h
95°F db / 75°F wb
Outdoor Air
10.0 EER
<65,000 Btu/h
47°F db / 43°F wb
Outdoor Air
3.0 COP
≥65,000 Btu/h and
<135,000 Btu/h
47°F db / 43°F wb
Outdoor Air
3.0 COP
≥135,000 Btu/h and
<240,000 Btu/h
47°F db / 43°F wb
Outdoor Air
3.0 COP
<30,000 Btu/h
95°F db / 75°F wb
Outdoor Air
9.2 EER
≥30,000 Btu/h and
<36,000 Btu/h
95°F db / 75°F wb
Outdoor Air
9.2 EER
<30,000 Btu/h
95°F db / 75°F wb
Outdoor Air
9.2 EER
≥30,000 Btu/h and
<36,000 Btu/h
95°F db / 75°F wb
Outdoor Air
9.2 EER
<30,000 Btu/h
47°F db / 43°F wb
Outdoor Air
3.0 COP
≥30,000 Btu/h and
<36,000 Btu/h
47°F db / 43°F wb
Outdoor Air
3.0 COP
Test Procedure c
ANSI/AHRI 390
TABLE 110.2-F HEAT TRANSFER EQUIPMENT
Equipment Type
Liquid-to-liquid heat exchangers
Subcategory
Minimum Efficiencya
Test Procedure b
Plate type
NR
ANSI/AHRI 400
a
NR = no requirement
b
Applicable test procedure and reference year are provided under the definitions
TABLE 110.2-G PERFORMANCE REQUIREMENTS FOR HEAT REJECTION EQUIPMENT
Performance
Total System Heat Rejection
Capacity at Rated Conditions
Subcategory or Rating
Condition
Propeller or axial fan
Open-circuit cooling towers
All
95°F entering water
85°F leaving water
75 °F entering air wb
42.1 gpm/hp
CTI ATC-105
and
CTI STD-201
Centrifugal fan
Open-circuit cooling towers
All
95°F entering water
85°F leaving water
75 °F entering air wb
20.0 gpm/hp
CTI ATC-105
and
CTI STD-201
Propeller or axial fan
closed-circuit cooling towers
All
102°F entering water
90°F leaving water
75 °F entering air wb
14.0 gpm/hp
CTI ATC-105S
and
CTI STD-201
Centrifugal fan
closed-circuit cooling towers
All
102°F entering water
90°F leaving water
75 °F entering air wb
7.0 gpm/hp
CTI ATC-105S
and
CTI STD-201
All
R-507A test fluid
165°F entering gas temperature
105°F condensing temperature
75°F entering wetbulb
 157,000 Btu/h·hp
CTI ATC-106
All
Ammonia test fluid
140°F entering gas temperature
96.3°F condensing temperature
75°F entering wetbulb
 134,000 Btu/h·hp
CTI ATC-106
All
R-507A test fluid
165°F entering gas temperature
105°F condensing temperature
75°F entering wetbulb
 135,000 Btu/h·hp
CTI ATC-106
All
Ammonia test fluid
140°F entering gas temperature
96.3°F condensing temperature
75°F entering wetbulb
 110,000 Btu/h·hp
CTI ATC-106
All
R22 test fluid
125°F condensing temperature
190°F entering gas temperature
15°F subcooling
95°F entering drybulb
 176,000 Btu/h·hp
ANSI/AHRI 460
Equipment Type
Propeller or axial fan
evaporative condensers
Propeller or axial fan
evaporative condensers
Centrifugal fan
evaporative condensers
Centrifugal fan
evaporative condensers
Air cooled condensers
a
a ,b, c, d
Required ,
Test Procedure
e
For purposes of this table, open-circuit cooling tower performance is defined as the water flow rating of the tower at the given rated
conditions divided by the fan motor nameplate power.
b
For purposes of this table, closed-circuit cooling tower performance is defined as the process water flow rating of the tower at the given
rated conditions divided by the sum of the fan motor nameplate rated power and the integral spray pump motor nameplate power .
c
For purposes of this table air-cooled condenser performance is defined as the heat rejected from the refrigerant divided by the fan motor
nameplate power.
d
Open cooling towers shall be tested using the test procedures in CTI ATC-105. Performance of factory assembled open cooling towers
shall be either certified as base models as specified in CTI STD-201 or verified by testing in the field by a CTI approved testing agency.
Open factory assembled cooling towers with custom options added to a CTI certified base model for the purpose of safe maintenance or
to reduce environmental or noise impact shall be rated at 90 percent of the CTI certified performance of the associated base model or at
the manufacturer’s stated performance, whichever is less. Base models of open factory assembled cooling towers are open cool ing
towers configured in exact accordance with the Data of Record submitted to CTI as specified by CTI STD-201. There are no
certification requirements for field erected cooling towers.
e
Applicable test procedure and reference year are provided under the definitions.
TABLE 110.2-H Electrically Operated Variable Refrigerant Flow (VRF) Air Conditioners
Minimum Efficiency Requirements
Equipment Type
VRF Air
Conditioners,
Air Cooled
Size Category
Heating
Section
Type
Sub-Category or
Rating Condition
Minimum Efficiency
<65,000 Btu/h
All
VRF Multi-split
System
13.0 SEER
≥65,000 Btu/h and
<135,000 Btu/h
Electric
Resistance
(or none)
VRF Multi-split
System
≥135,000 Btu/h and
<240,000 Btu/h
Electric
Resistance
(or none)
VRF Multi-split
System
≥240,000 Btu/h
Electric
Resistance
(or none)
VRF Multi-split
System
Test
a
Procedure
11.2 EER
13.1 IEER
b
ANSI/AHRI
1230
11.0 EER
12.9 IEER
b
10.0 EER
11.6 IEER
b
a
Applicable test procedure and reference year are provided under the definitions.
b
IEERs are only applicable to equipment with capacity control as per ANSI/AHRI 1230 test procedures.
TABLE 110.2-I Electrically Operated Variable Refrigerant Flow Air-to-Air and Applied Heat Pumps - Minimum
Efficiency Requirements
Equipment Type
Sub-Category or Rating
Condition
Minimum
Efficiency
All
VRF Multi-split System
13.0 SEER
≥65,000 Btu/h and
<135,000 Btu/h
Electric Resistance
(or none)
VRF Multi-split System a
≥135,000 Btu/h and
<240,000 Btu/h
Electric Resistance
(or none)
VRF Multi-split System a
Electric Resistance
(or none)
VRF Multi-split System a
All
VRF Multi-split systems a
Size Category
<65,000 Btu/h
VRF Air Cooled,
(cooling mode)
≥240,000 Btu/h
<65,000 Btu/h
Heating Section
Type
Test Procedure b
11.0 EER
12.9 IEER c
AHRI 1230
10.6 EER
12.3 IEER
c
9.5 EER
11.0 IEER c
12.0 EER
AHRI 1230
86ºF entering water
VRF Water source
≥65,000 Btu/h and
(cooling mode)
<135,000 Btu/h
≥135,000 Btu/h
All
VRF Multi-split System a
12.0 EER
86ºF entering water
All
VRF Multi-split System a
10.0 EER
86ºF entering water
<135,000 Btu/h
All
VRF Groundwater
source (cooling
mode)
VRF Multi-split System
16.2 EER
AHRI 1230
59ºF entering water
≥135,000 Btu/h
All
VRF Multi-split System a
13.8 EER
59ºF entering water
<135,000 Btu/h
All
VRF Ground source
(cooling mode)
VRF Multi-split System a
13.4 EER
77ºF entering water
≥135,000 Btu/h
All
VRF Multi-split System a
77ºF entering water
11.0 EER
AHRI 1230
Equipment Type
Size Category
Heating
Section
Type
Sub-Category or Rating
Condition
Minimum Efficiency
Test
Procedure b
<65,000 Btu/h
---
VRF Multi-split System
7.7 HSPF
AHRI 1230
---
VRF Multi-split system
3.3 COP
(cooling capacity)
≥65,000 Btu/h and
<135,000 Btu/h
47ºF db/ 43ºF wb outdoor
air
(cooling capacity)
VRF Multi-split system
2.25 COP
VRF Air Cooled
17ºF db/15ºF wb outdoor
air
(heating mode)
≥135,000 Btu/h
---
(cooling capacity)
VRF Multi-split system
3.2 COP
47ºF db/ 43ºF wb outdoor
air
VRF Multi-split system
2.05 COP
17ºF db/15ºF wb outdoor
air
<135,000 Btu/h
VRF Water source
---
(cooling capacity)
VRF Multi-split System
4.2 COP
AHRI 1230
68ºF entering water
(heating mode)
≥135,000 Btu/h
---
(cooling capacity)
VRF Groundwater
source
(heating mode)
<135,000 Btu/h
---
<135,000 Btu/h
VRF Multi-split System
3.6 COP
AHRI 1230
50ºF entering water
---
(cooling capacity)
VRF Ground source
3.9 COP
68ºF entering water
(cooling capacity)
≥135,000 Btu/h
VRF Multi-split System
VRF Multi-split System
3.3 COP
50ºF entering water
---
(cooling capacity)
VRF Multi-split System
3.1 COP
AHRI 1230
32ºF entering water
(heating mode)
≥135,000 Btu/h
(cooling capacity)
---
VRF Multi-split System
2.8 COP
32ºF entering water
a
Deduct 0.2 from the required EERs and IEERs for Variable Refrigerant Flow (VRF) Multi-split system units with
a heating recovery section.
b
c
Applicable test procedure and reference year are provided under the definitions.
IEERs are only applicable to equipment with capacity control as per ANSI/AHRI 1230 test procedures.
.
TABLE 110.2-J Warm-Air Furnaces and Combination Warm-Air Furnaces/Air-Conditioning Units, Warm-Air Duct
Furnaces, and Unit Heaters
Equipment Type
Warm-Air Furnace, GasFired
Size Category
(Input)
< 225,000 Btu/h
≥ 225,000 Btu/h
Warm-Air Furnace, oilFired
< 225,000 Btu/h
≥ 225,000 Btu/h
Subcategory or Rating
Condition
Minimum
Efficiency
Test Procedurea
Maximum Capacityb
78% AFUE or 80% Et
DOE 10 CFR Part 430 or Section 2.39, Thermal
Efficiency, ANSI Z21.47
Maximum Capacityb
80% Et
Section 2.39, Thermal Efficiency, ANSI Z21.47
Maximum Capacityb
78% AFUE or 80% Et
DOE 10 CFR Part 430 or Section 42, Combustion, UL
727
Maximum Capacityb
81% Et
Section 42, Combustion, UL 727
Warm-Air Duct Furnaces,
Gas-Fired
All Capacities
Maximum Capacityb
80% Ec
Section 2.10, Efficiency, ANSI Z83.8
Warm-Air Unit Heaters,
Gas-Fired
All Capacities
Maximum Capacityb
80% Ec
Section 2.10, Efficiency, ANSI Z83.8
Warm-Air Unit Heaters,
Oil-Fired
All Capacities
Maximum Capacityb
81% Ec
Section 40, Combustion, UL 731
a
Applicable test procedure and reference year are provided under the definitions.
b
Compliance of multiple firing rate units shall be at maximum firing rate.
c
Combustion units not covered by NAECA (3-phase power or cooling capacity greater than or equal to 19 kW) may
comply with either rating.
d
Et= thermal efficiency. Units must also include an interrupted or intermittent ignition device (IID), have jacket losses not
exceeding 0.75% of the input rating, and have either power venting or a flue damper. A vent damper is an acceptable
alternative to a flue damper for those furnaces where combustion air is drawn from the conditioned space.
e
f
Ec= combustion efficiency (100% less flue losses). See test procedure for detailed discussion.
As of August 8, 2008, according to the Energy Policy Act of 2005, units must also include interrupted or intermittent
ignition device (IID) and have either power venting or an automatic flue damper.
TABLE 110.2-K Gas- and Oil-Fired Boilers, Minimum Efficiency requirements
Minimum Efficiency b,c
Equipment
Sub
Size Category
Test Procedure a
Type
Category
(Input)
Before 3/2/2022
After 3/1/2022
< 300,000 Btu/h
82% AFUE
80% Et
80% Et
82% Ec
82% Ec
84% AFUE
84% AFUE
82% Et
82% Et
84% Ec
84% Ec
80% AFUE
80% AFUE
DOE 10 CFR Part
430
79% Et
79% Et
DOE 10 CFR Part
431
79% Et
79% Et
DOE 10 CFR Part
431
77% Et
79% Et
DOE 10 CFR Part
431
e
77% Et
79% Et
< 300,000 Btu/h
82% AFUE
82% AFUE
≥ 300,000 Btu/h
and
≤ 2,500,000 Btu/h d
> 2,500,000 Btu/h e
81% Et
81% Et
DOE 10 CFR Part
431
81% Et
81% Et
DOE 10 CFR Part
431
≥ 300,000 Btu/h
and
Gas-Fired
≤ 2,500,000 Btu/h d
> 2,500,000 Btu/h
e
Boiler, hot
water
< 300,000 Btu/h
Oil-Fired
≥ 300,000 Btu/h
and
≤ 2,500,000 Btu/h d
> 2,500,000 Btu/h
e
Gas-Fired
< 300,000 Btu/h
≥ 300,000 Btu/h
Gas-Fired
and
all, except ≤ 2,500,000 Btu/h d
natural
e
draft > 2,500,000 Btu/h
≥ 300,000 Btu/h
and
Gas-Fired,
d
Boiler, steam natural ≤ 2,500,000 Btu/h
draft
> 2,500,000 Btu/h
Oil-Fired
DOE 10 CFR Part
430
82% AFUE
DOE 10 CFR Part
431
DOE 10 CFR Part
430
DOE 10 CFR Part
431
DOE 10 CFR Part
431
DOE 10 CFR Part
430